Overview

Comprehensive Description

Description

Prostomium blunt, anteriorly truncate or rounded, anterior margin with entire anterior margin. Lateral horns absent. Caruncle present. Occipital antenna absent. Nuchal organ short, at most one segment long. Eyes absent. Palps simple, lacking basal sheath. Dorsal ridge connecting bases of branchiae on chaetiger 1 absent. Prominent dorsal collar on setiger 2 absent. Dorsal branchiae absent. First branchiae without process at base on anterior face. Accessory branchiae arising from posterior part of notopodium absent. Ventral branchiae absent. Chaetiger 3 without filament at base of branchiae. Dorsal crests absent. Ventral crests absent. Chaetiger 1 notopodium present. Chaetiger 1 notochaetae absent. Neuropodial lobe of chaetiger 2 rounded, approximately symmetrical. Neuropodial lobes of posterior chaetigers a single lobe. Interparapodial pouches absent. Chaetigers 2–4 similar, not strongly differentiated. Chaetiger 5 highly modified, enlarged and with specialised chaetae, with two types of modified spine present; simple, curved or subdistally inflated spines present; spines with subdistal tooth or flange absent; pennoned spines, with strongly asymmetrical tips absent; spines with flattened or cup-shaped tip present; spines with terminal or subterminal bristles absent; companion chaetae absent. Posterior modified notochaetae absent. Notopodial hooded hooks absent. Neurochaetae of chaetiger 1 simple capillaries similar to those of subsequent chaetigers. Neuropodial hooded hooks present, first present on chaetiger 7. Neuropodial hooded hooks with accessory tooth or teeth above the main fang, 1 accessory tooth (bidentate), secondary tooth and main fang forming a prominent angle, about 90º or more. Shaft of neuropodial hooded hooks of constant thickness, lacking a constriction. Neuropodial sabre chaetae absent. Neuropodial spines absent. Embedded bunches of notopodial needle chaetae absent. Pygidium reduced, with 2–4 distinct knobs.

Description generated from: Wilson, RS & McDiarmid, H 2013. Spionidae (Polychaeta)- A DELTA database of genera, and Australian species. Version 2; originally published as In RS Wilson, PA Hutchings & CJ Glasby (eds) Polychaetes: An Interactive Identification Guide. CSIRO Publishing, Melbourne.

Additional references:
Blake, JA. 1983. Polychaetes of the family Spionidae from South America, Antarctica, and adjacent seas and islands. Antarctic Research Series 39, 205-287.

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Distribution

Distribution within Australia: Not known from Australia.

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Physical Description

Diagnostic Description

Diagnosis

Diagnosis by Paterson & Gibson (2003: 734): ''Prostomium is entire on anterior margin, extending posteriorly as a caruncle; eyes are present or absent; nuchal tentacle is absent. Chaetiger 1 is without notochaetae. Modified chaetiger 5 has two types of major notopodial spines: (1) anterior spines are distally expanded with terminal tooth and surrounding collar; (2) posterior spines are simple acicular; superior notochaetal and neurochaetal fascicles are present. Hooded hooks are bidentate, from chaetiger 7, with conspicuous angle between teeth and no constriction on the shaft. Branchiae are absent. Prominent dorsal bacillary glands are present on anterior chaetigers. Pygidium is reduced.'' The original diagnosis by Blake (1983: 253) was emended by Paterson & Gibson (2003: 734) to include species with eyes.
  • Paterson, I.G.; Gibson, G.D. (2003). A new species of Amphipolydora (Polychaeta: Spionidae) from New Zealand. New Zealand Journal of Marine and Freshwater Research. 37(4): 733-740.   10.1080/00288330.2003.9517203 External link.
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Source: World Register of Marine Species

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Ecology

Habitat

Probably a genus of specialist sponge borers reproducing by architomy to form colonies thereon (A. vestalis), although the type was not recorded as associated with a sponge (but see comments of Paterson & Gibson, 2003)
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Insufficient data.

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